As the 18th century ends, the Comanches have made peace with the Spanish colonists in New Mexico. No one is as relieved as Marco and his wife Paloma, who live on the edge of Comanchería. Then a new threat emerges: a renegade Comanche. Flanked by a disgraced lieutenant, a band of horse traders, and a slave girl, Marco and his friend Toshua venture north to defeat Great Owl or die trying.